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1、情态动词I情态动词的特征：1.本身有词义。2.不能独立作谓语。2.后接动词原形一起构成谓语。3.不随人称和数的变化。II情态动词各自的基本意义及用法:1・can与could用法对比点cancould1、表“能力"Canyouliftthisheavybox?IcouldrTtunderstandwhathesaidatall.2、表“许可”Youcanuseadifferentmaterialinstead.HesaidIcouldborrowhisbike.3、“怀疑”No,no,itcaiftbetrue.Whatonearthcanthismean?
2、Wethoughtthestorycouldnotbetrue.Howcouldyoubesocareless?4^can与beableto区别1.could代替can,表示语气更为婉转。Eg.CouldIuseyourbike?Yes,Ican2.can（能够）=beableto（仅表能力时）,但beableto表示一番努力后,才能做得到，且有更多的时态。2.may与might用法对比点maymight1.表“询问"MayI...?（=CanI...?）MightI…?（二CouldI...?）（但比用may更客气）2表吮许”Youmaytaketheb
3、oythere.Hetoldmehemightcome,（might与told相呼应）3.表呵能皿或许"Shemaynorlikethisplace.Fmafraidhemightnotlikethisplay.注：1.Mayl...?的答语。2.may可表示期望或祝愿Mayyousucceed!3.may（might）用于目的状语从句。肯定:Yes,youmay.否定：No,youmustn't不行（语气强硕）No,youmaynot或No,you，dbetternotTheemperorgavethemsomegoldinorderthattheymi
4、ghtbegintheirworkatonce.3.must与haveto用法对比点musthaveto1.表“必须"（主观看法）必须；没有过去式，可用于间接引语屮。HetoldmeImustdoaccordingtowhathesaid・（客观需要）不得不，有多种时态。It，srainingheavily,wecan'tgonow.2.疑问句MustI•••?Yes,youmust.（一定）No,youneedn^t./youdon5thaveto.Doyouhavetogotoday?Yes,wedo.Youdon'thavetoworryaboutt
5、hat.1（不必）4.need与dare用法对比点needdare1•情态V.+动词原形1）否定式2）疑问式Heneednot(needn^t)go.…Needwedoitagain?…No,youneedn^tdoitagain.Hedarenotsayso.Dareshegooutaloneatnight?HowdareyousayFmunfair?Ifhedaredothat,he'llbepunished.Idaresay.(固定用法)2•实义v.+todo1）肯定式2）否定式3）疑问式Heneedstogo.Hedoesn^t(doesnot)n
6、eedtogo.Doesheneedtodoitagain?No,hedoesn^tneedotdoitagain.Hedarestosay.Hedoesnot(doesn't)daretosay.Ifyoudaretojumpintothewaterfromhere,sodareI.3.didnotneedtodo表示过去没必要做ShedidrTtneedtoattendthemeetingyesterday,andshestayedwithherchildren^她没有参加)5-should与oughtto用法对比点shouldoughtto1、表“应
7、该”表劝告、建议Youshouldlistentothedoctor^advice.WeshouldlearnfromZhangHua.“有责任有必要F故某事Yououghttofinishyourworkbeforeyougohome.Weoughttohelpeachother.2、表“估计"Theyshouldgethomebynow.“非常可能"的事，可译为“总应该"Ifwestarttoworkrightnow,weoughttofinishitbeforelunch.注：1)should还可在虚拟语气中的使用2)注意：oughtto的疑问式及否
8、定式---Oughthetogo?---Yes,Ithinkheo
